P2129Throttle/Pedal Position Sensor/Switch E Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2129 is meant for short dropouts or spikes in signal circuit E that do not last long enough for a steady low or high fault. No manufacturer documents this code publicly. GM and Ford, which assign E to the second pedal sensor, catch such glitches inside their circuit codes instead: GM counts failures every 12.5 ms and flags the APP sensor 2 circuit after 19 of 39 counts (P2125/P2127/P2128), Ford uses 0.25/4.75 V limits. CARB requires circuit monitoring of input sensors; the code fits that duty. Check for loose pins and harness chafing with the pedal moved slowly. Effects range from a warning lamp to brief power cuts while driving.
- What you may notice
- Warning lamp that comes and goes
- Brief hesitation or power loss while driving
- Reduced power mode after repeated dropouts
- Likely causes
- LikelyLoose terminal or poor pin tension at the pedal connector
- PossibleChafed harness making intermittent contact
- PossibleWorn spot or cracked joint inside the pedal sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.